Basis of Presentation and Significant Accounting Policies	3 Months Ended
Mar. 31, 2019
Accounting Policies [Abstract]
Basis of Presentation and Significant Accounting Policies	Basis of Presentation and Significant Accounting Policies The Condensed Consolidated Financial Statements of IDEX Corporation (“IDEX,” “we,” “our,” or the “Company”) have been prepared in accordance with accounting principles generally accepted in the United States of America (“U.S. GAAP”) applicable to interim financial information and the instructions to Form 10-Q under the Securities Exchange Act of 1934, as amended. The statements are unaudited but include all adjustments, consisting only of recurring items, except as noted, that the Company considers necessary for a fair presentation of the information set forth herein. The results of operations for the three months ended March 31, 2019 are not necessarily indicative of the results to be expected for the entire year. The Condensed Consolidated Financial Statements and Management’s Discussion and Analysis of Financial Condition and Results of Operations set forth in this report should be read in conjunction with the Company’s Annual Report on Form 10-K for the year ended December 31, 2018. Recently Adopted Accounting Standards In February 2016, the Financial Accounting Standard Board (“FASB”) issued Accounting Standards Update (“ASU”) 2016-02, Leases, which sets out the principles for the recognition, measurement, presentation and disclosure of leases for both parties to a contract (i.e. lessees and lessors). The standard introduces a new lessee model that will require most leases to be recorded on the balance sheet and eliminates the required use of bright line tests in current U.S. GAAP for determining lease classification. In July 2018, the FASB issued the following standards which clarify ASU 2016-02 and have the same effective date as the original standard: ASU 2018-10, Codification Improvements to Topic 842, Leases and ASU 2018-11, Leases (Topic 842): Targeted Improvements. ASU 2018-11 includes an option to not restate comparative periods in transition and elect to use the effective date of ASU 2016-02 as the date of initial application of transition. In March 2019, the FASB issued ASU 2019-01, Leases (Topic 842): Codification Improvements, which clarifies ASU 2016-02 and is effective for fiscal years beginning after December 15, 2019 and interim periods within those fiscal years. The Company adopted this standard on January 1, 2019 using the optional transition method provided by the FASB in ASU 2018-11. As we did not restate comparative periods, the adoption had no impact on our previously reported results. We elected to use the practical expedient that allowed us to not reassess: (1) whether any expired or existing contracts are or contain leases, (2) lease classification for any expired or existing leases and (3) initial direct costs for any expired or existing leases as well as the practical expedient that allows lessees to treat the lease and non-lease components of leases as a single lease component for all asset classes. We also elected to account for short-term leases in accordance with Accounting Standards Codification (“ASC”) 842-20-25-2. The adoption of this standard had a material impact on our condensed consolidated balance sheet due to the recognition of right of use assets and lease liabilities. Upon adoption, we recognized right of use assets and lease liabilities of approximately $68 million that reflected the present value of future lease payments. The adoption of this standard did not have a material impact on our condensed consolidated results of operations or cash flows. See Note 13 for further information.

Basis of Presentation and Significant Accounting Policies

The Condensed Consolidated Financial Statements of IDEX Corporation (“IDEX,” “we,” “our,” or the “Company”) have been prepared in accordance with accounting principles generally accepted in the United States of America (“U.S. GAAP”) applicable to interim financial information and the instructions to Form 10-Q under the Securities Exchange Act of 1934, as amended. The statements are unaudited but include all adjustments, consisting only of recurring items, except as noted, that the Company considers necessary for a fair presentation of the information set forth herein. The results of operations for the three months ended March 31, 2019 are not necessarily indicative of the results to be expected for the entire year.

The Condensed Consolidated Financial Statements and Management’s Discussion and Analysis of Financial Condition and Results of Operations set forth in this report should be read in conjunction with the Company’s Annual Report on Form 10-K for the year ended December 31, 2018.

Recently Adopted Accounting Standards

In February 2016, the Financial Accounting Standard Board (“FASB”) issued Accounting Standards Update (“ASU”) 2016-02, Leases, which sets out the principles for the recognition, measurement, presentation and disclosure of leases for both parties to a contract (i.e. lessees and lessors). The standard introduces a new lessee model that will require most leases to be recorded on the balance sheet and eliminates the required use of bright line tests in current U.S. GAAP for determining lease classification. In July 2018, the FASB issued the following standards which clarify ASU 2016-02 and have the same effective date as the original standard: ASU 2018-10, Codification Improvements to Topic 842, Leases and ASU 2018-11, Leases (Topic 842): Targeted Improvements. ASU 2018-11 includes an option to not restate comparative periods in transition and elect to use the effective date of ASU 2016-02 as the date of initial application of transition. In March 2019, the FASB issued ASU 2019-01, Leases (Topic 842): Codification Improvements, which clarifies ASU 2016-02 and is effective for fiscal years beginning after December 15, 2019 and interim periods within those fiscal years.

The Company adopted this standard on January 1, 2019 using the optional transition method provided by the FASB in ASU 2018-11. As we did not restate comparative periods, the adoption had no impact on our previously reported results. We elected to use the practical expedient that allowed us to not reassess: (1) whether any expired or existing contracts are or contain leases, (2) lease classification for any expired or existing leases and (3) initial direct costs for any expired or existing leases as well as the practical expedient that allows lessees to treat the lease and non-lease components of leases as a single lease component for all asset classes. We also elected to account for short-term leases in accordance with Accounting Standards Codification (“ASC”) 842-20-25-2. The adoption of this standard had a material impact on our condensed consolidated balance sheet due to the recognition of right of use assets and lease liabilities. Upon adoption, we recognized right of use assets and lease liabilities of approximately $68 million that reflected the present value of future lease payments. The adoption of this standard did not have a material impact on our condensed consolidated results of operations or cash flows. See Note 13 for further information.